This operation is not allowed because domain <UUID> does not have NSX deployed with Overlay configuration."VMware VCF 5.2.x
By default, the Add Edge Cluster option is not available in Brownfield deployed VCF/SDDC.
NSX-T Manager is deployed along with VCF in Brownfield deployment, virtual networking configuration needs to be performed manually.
Run the sync operations using Brownfield script:
python3 vcf_brownfield.py sync --domain-name <selected-domain-name>